异常拦截-数据校验
SSM框架集成数据校验:
导入相关jar包
SSM集成所有jar包+以下jar包
classmate-1.3.4.jar
jboss-logging-3.3.3.Final.jar
validation-api-2.0.1.Final.jar
hibernate-validator-6.0.17.Final.jar
数据校验工具类
package com.sxt.common.validate;
import java.util.Set;
import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import org.springframework.validation.BindException;
import com.sxt.common.CodeMsg;
import com.sxt.common.exception.BussiException;
public class ValidatorUtils {
private static Validator validator;
static {
//构建Validator 对象
validator = Validation.buildDefaultValidatorFactory().getValidator();
}
/**
* 校验对象
* @param object 待校验对象
* @param groups 待校验的组
* @throws BindException 校验不通过，则报RRException异常
*/
public static void validateEntity(Object object, Class<?>... groups)
throws BussiException {
Set<ConstraintViolation<Object>> constraintViolations = validator.validate(object, groups);
if (!constraintViolations.isEmpty()) {
StringBuilder msg = new StringBuilder();
for(ConstraintViolation<Object> constraint: constraintViolations){
msg.append(constraint.getMessage());
break;
}
throw new BussiException(CodeMsg.PARAM_VALIDATE_ERROR,msg.toString());
}
}
}
业务信息枚举
package com.sxt.common;
/**
* 业务信息枚举
* @author mrt
*
*/
public enum CodeMsg {
//成功
SUCCESS(200,"SUCCESS"),
//数据校验
PARAM_VALIDATE_ERROR(400100003,"参数校验异常:"),
int code;
String msg;
CodeMsg(int code,String msg) {
this.code = code;
this.msg = msg;
}
public int getCode() {
return code;
}
public void setCode(int code) {
this.code = code;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
}
统一JSON结果类:
package com.sxt.common;
import java.io.Serializable;
/**
* 用于返回json 数据
* @author mrt
*
*/
public class Result implements Serializable {
private static final long serialVersionUID = -5948622670638601979L;
//业务响应码
private int code ;
//业务消息
private String msg;
//业务数据
private Object data;
public Result() {
this.code = CodeMsg.SUCCESS.getCode();
this.msg = CodeMsg.SUCCESS.getMsg();
}
public Result(Object data) {
this.code = CodeMsg.SUCCESS.getCode();
this.msg = CodeMsg.SUCCESS.getMsg();
this.data = data;
}
public Result(CodeMsg codeMsg) {
this.code = codeMsg.getCode();
this.msg = codeMsg.getMsg();
}
public int getCode() {
return code;
}
public void setCode(int code) {
this.code = code;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public Object getData() {
return data;
}
public void setData(Object data) {
this.data = data;
}
}
业务异常类:
package com.sxt.common.exception;
import com.sxt.common.CodeMsg;
/**
* 业务异常类
* @author mrt
*
*/
public class BussiException extends RuntimeException{
private static final long serialVersionUID = 1L;
private CodeMsg codeMsg;
public BussiException(CodeMsg codeMsg,String msg) {
super(codeMsg.toString());
this.codeMsg = codeMsg;
codeMsg.setMsg(msg);
}
public CodeMsg getCodeMsg() {
return codeMsg;
}
}
全局业务异常拦截
package com.sxt.common.hanlder;
import javax.servlet.http.HttpServletRequest;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import com.sxt.common.Result;
import com.sxt.common.exception.BussiException;
@ControllerAdvice
public class GlobalExceptionHandler {
/**
* 只处理业务异常 非业务异常考虑使用跳转页面
* @param request
* @param exception
* @return
*/
@ExceptionHandler(BussiException.class)
@ResponseBody
public Object allExceptionHandler(HttpServletRequest request, Exception exception) {
exception.printStackTrace();
//判断是否是业务异常
BussiException ex = (BussiException)exception;
return new Result(ex.getCodeMsg());
}
}
注意:
扫描业务异常拦截类上的注解
接收数据实体类:
package com.sxt.form;
import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotNull;
import org.hibernate.validator.constraints.Length;
import org.hibernate.validator.constraints.Range;
public class UserForm {
@Min(value = 0,message = "id最小值为0")
@Max(value = 20,message = "id最大值为20")
@NotNull(message = "id值不能为空")
private Integer id;
@Length(min = 10,max=20,message = "name 最小10位数 最大20位")
@NotBlank(message = "name值不能为空")
private String name;
@Range(min=1,max=2,message="性别的值只能是1 或者 2")
private String sex;
public UserForm() {}
public UserForm(int id, String name, String sex) {
super();
this.id = id;
this.name = name;
this.sex = sex;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
@Override
public String toString() {
return "User [id=" + id + ", name=" + name + ", sex=" + sex + "]";
}
}
示例controller方法:
/**
* 使用userForm接收前端数据
* 然后统一进行校验
* @param userForm
* @return
*/
@RequestMapping("/test.do")
@ResponseBody
public String test(UserForm userForm) {
ValidatorUtils.validateEntity(userForm);
return "success";
}
附录:Validation 内置注解
@Null 被注释的元素必须为 null
@NotNull 被注释的元素必须不为 null
@AssertTrue 被注释的元素必须为 true
@AssertFalse 被注释的元素必须为 false
@Min(value) 被注释的元素必须是一个数字，其值必须大于等于指定的最小值
@Max(value) 被注释的元素必须是一个数字，其值必须小于等于指定的最大值
@DecimalMin(value) 被注释的元素必须是一个数字，其值必须大于等于指定的最小值
@DecimalMax(value) 被注释的元素必须是一个数字，其值必须小于等于指定的最大值
@Size(max=, min=) 被注释的元素的大小必须在指定的范围内
@Digits(integer, fraction) 被注释的元素必须是一个数字，其值必须在可接受的范围内
@Past 被注释的元素必须是一个过去的日期
@Future 被注释的元素必须是一个将来的日期
@Pattern(regex=,flag=) 被注释的元素必须符合指定的正则表达式
Hibernate Validator 附加的 constraint:
@NotBlank 验证字符串非null，且长度必须大于0
@Email 被注释的元素必须是电子邮箱地址
@Length(min=,max=) 被注释的字符串的大小必须在指定的范围内
@NotEmpty 被注释的字符串的必须非空
@Range(min=,max=,message=) 被注释的元素必须在合适的范围内
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